Definitions
1.nounA feeling of apprehension, doubt, fear etc.
2.nounA sudden sickly feeling; queasiness.
3.nounA prick of the conscience; a moral scruple, a pang of guilt. (Now often in negative constructions.)"This lawyer has no qualms about saving people who are on the wrong side of the law."
4.nounMortality; plague; pestilence.
5.nounA calamity or disaster.
6.verbTo have a sickly feeling.